– ZTE does not officially publish a generic "flash tool" for consumer routers. Firmware updates are typically done through the router's web interface (192.168.1.1 or similar) using an official firmware file from ZTE or your ISP.

Update : ZTE IMEI flash tool for "IMEI ALL 0" machine - MoDaCo

: For total control or deep debugging, you may need to open the router and solder pins to a UART adapter (like the CP2102) to gain access to the shell. Specialized Third-Party Tools

You have a bricked router, a spare unit to experiment with, or need to remove TR-069 ISP backdoors.

2. Specialized Flashing Tools for Mobile Hotspots (MF Series)